//
//  InfiniteOffsetEffect.swift
//
//  SlidingRuler
//
//  MIT License
//
//  Copyright (c) 2020 Pierre Tacchi
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.
//


import SwiftUI

struct InfiniteOffsetEffect: GeometryEffect {
    var offset: CGSize
    let maxOffset: CGFloat
    
    var correctedOffset: CGSize {
        let tx = offset.width.truncatingRemainder(dividingBy: maxOffset)
        return .init(horizontal: tx)
    }
    
    var animatableData: CGSize.AnimatableData {
        get { offset.animatableData }
        set { offset.animatableData = newValue }
    }
    
    func effectValue(size: CGSize) -> ProjectionTransform {
        assert(!size.width.isNaN && !size.height.isNaN)
        return ProjectionTransform(CGAffineTransform(translationX: correctedOffset.width, y: correctedOffset.height))
    }
}

